MS21280B, MILITARY STANDARD: BOLT, MACHINE - STEEL, DOUBLE HEXAGON, EXTENDED WASHER, .250-28 (MIL-S-8879 THREAD) (17 SEP 1963)
MS21280B, MILITARY STANDARD: BOLT, MACHINE - STEEL, DOUBLE HEXAGON, EXTENDED WASHER, .250-28 (MIL-S-8879 THREAD) (17 SEP 1963).